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conchoidal
This term is a specialized technical descriptor used primarily in geology, mineralogy, and archaeology. It describes a specific type of breakage where the resulting surface is smooth and curved, creating a series of concentric ripples. This is most famously associated with volcanic glass (obsidian) and quartz.
Because it is a highly specific scientific term, it is rarely used in casual conversation. In a non-technical context, one might describe such a surface as "shell-like" or "curved," but "conchoidal" is the precise requirement for academic or professional reports regarding material fractures.
Meanings
Examples
Obsidian is well known for its distinct conchoidal fracture.
Look at the way this glass broke into conchoidal shards.
The prehistoric hunter used a conchoidal flake to create a sharp edge.
This specimen shows a classic conchoidal pattern on the break surface.
I wonder if this quartz fragment has a conchoidal surface.
The impact of the meteorite left behind several conchoidal fractures in the bedrock.
Check for a conchoidal break to confirm if the material is amorphous.
The edges of the flint tool are curved and conchoidal.
It has a smooth, conchoidal appearance similar to a seashell.
It has a smooth, conchoidal appearance similar to a seashell.